Comparison of η Car’s observed and model continuum visibilities. Top: observed η Car visibilities inthe continuum near Brα versus spatial frequency, and the visibility curve of the rescaled CMFGEN model (red line; rescaling factor = 1.0046; see text). Bottom: CMFGEN model intensity CLV of the η Car primary stellar wind in the continuum near Brα. The FWHMdiameter of the rescaled model is 6.54 au (or 2.84 mas at a distance of 2.3 kpc).